Although the FBI says it will keep the technique it used to unlock Farook's iPhone 5c a secret, sources tell Reuters that the agency can use the method on other iPhone 5c's running iOS 9. The FBI has physical possession of the mechanism used to unlock the phone and does not need to pay the contractor any more money for further uses.
The contractor responsible for the method is a closely-held secret within the FBI, with Comey being in the dark himself, according to Reuters' sources. In mid-April, it was reported that the FBI hired "professional hackers," at least one of which is a gray hat researcher that sells flaws to governments, black market groups or surveillance companies.
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